Industrial 57404-1F Network Communications Module

Reliance's 57404-1F Network Communications Module is the AutoMax PLC network interface card designed to connect a Reliance Electric AutoMax rack to the DCS‑NET network, enabling cross-rack communication and network diagnostics within legacy automation systems. The module’s faceplate provides a 25‑pin D‑shell MONITOR port for RS‑232 asynchronous linking, a 9‑pin NETWORK connector, two thumbwheel switches, indicator lights, and a seven‑segment LED display that conveys error codes. Inside lies a printed circuit board with a watchdog timer and an on‑board CPU, plus the status LEDs and LED readout used for on‑rack diagnostics, all housed in a protective enclosure as part of the network module assembly. The 57404‑1F variant is specifically the Reliance network communications module used with AutoMax DCS‑NET networks; this model is no longer in production and is typically sourced through used‑equipment or repairs channels. In practical terms, it serves as the local and networked communication bridge in AutoMax installations, supporting monitoring and network‑level coordination across Reliance AutoMax racks.